I do think that gdkp can be (and was) exploited by RMT players. But the players themselves cannot be considered RMTers.
I think your default gdkp player simply raids for their cut and uses their cut to buy the gear they want when it drops. They won’t care if there is rmt allowed or not.
RMT world
Cut 5000g
Item they want cost 2000g, and 3000g.
*Non rmt world if they somehow could find a way to prevent 100% of all rmt.
Cut 500G
Items they want cost 200g, and 300g.
Even without the RMT juiced pots, the average gdkp player would be happy. Because they can still use their favorite loot method.